Garmin SA01456Wi_D Manual download pdf (Page 245)

G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air Page 7-15

190-00682-01 Revision F

7.4.2.2 ITT Functional Test

Required test equipment:

Test Equipment Make/Requirement Model/Part Nbr

Signal Generator 0-10Vdc / 0 – 1k Hz As appropriate

1. Remove left engine ITT thermocouple terminals from sensor. Using a signal generator, inject a DC

signal into the No. 1 GEA via left engine firewall connectors-pins, as follows:

S/N LJ-1063 thru LJ-1360, LJ-1362: J104-T* (LO) and J104-W* (HI)

S/N LJ-1361, LJ-1363 and after: J104-P* (LO) and J104-S* (HI)

2. Simulate the following voltages, and verify the indication and status:

Test Point (mV) Indication (degC) Status Configurations

16.40 +/- .28 400*

bottom of green band

green digital

all

44.3 +/- .28 1090*

red triangle, start mode

red digital**

all

(*) verify value displayed is within test point tolerances

(**) steady after 5 seconds

3. On the right hand circuit breaker panel, open the GIA1 (PRI) and GIA1 (SEC) circuit breakers, and

verify the last observed ITT indication remains unchanged.

4. Close the GIA1 (PRI) and GIA1 (SEC) circuit breakers, and wait until the COM1 and NAV1 fields

are valid.

5. Repeat steps 1 and 2 using the No. 2 GEA via right engine firewall connectors-pins specified below

and right engine ITT thermocouple.

S/N LJ-1063 thru LJ-1360, LJ-1362: J105-T* (LO) and J105-W* (HI)

S/N LJ-1361, LJ-1363 and after: J105-P* (LO) and J105-S* (HI)

6. Pull the GIA 2 circuit breaker, and verify the last observed ITT indication remains unchanged.

7. Close the GIA 2 circuit breaker, and wait until the COM2 and NAV2 field are valid.

8. If no other tests will be completed in this section, do the following:

a. Disconnect test equipment.

b. Ensure firewall connectors are reconnected.

c. Verify all engine parameters are displayed valid on the MFD with no Red X’s.

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Garmin SA01456Wi_D Manual Page 245